Cold rolled steel part for use in construction work, together with laminated plasterboard and gypsum board products where the frame is not load-bearing. U-shaped profile, used for shelves and furniture with Pladur Alveo panels and as the perimeter frame for ceilings. It has a nominal width of 31 mm, with wings measuring 30 mm. It is made of 0.55-mm thick Z140 galvanised steel plate.